llvm dev - Dec 2018 - bootstrapping llvm with advanced configuration

I can build llvm and associated tools in a 1 shot go using gcc and g++ but
trying to use only gcc and bootstrap clang to build and link with libc++
and libc++abi

on the second phase of the build, the compilation fails

I have svn cloned
LLVM
CLANG
CLANG_XTRA_TOOLS
LLD
LLDB
POLLY
COMPILER_RT
OPENMP
LIBCXX
LIBCXXABI

cmake command below
cmake -DCMAKE_BUILD_TYPE=Release
-DLLVM_ENABLE_ASSERTIONS=OFF -DCMAKE_INSTALL_PREFIX=/usr/local -GNinja
-DCLANG_ENABLE_BOOTSTRAP=ON ../toolchain70/llvm/

after that cmake command I run ninja stage2 which compiles about 3700
objects then it proceeds to try and compile the full 5000 plus objects but
fails with errors like these:

_toolchain70/llvm/projects/libcxx/include/cstdlib:114:9: error: no member
named 'strtold' in the global namespace
using ::strtold;
      ~~^
fatal error: too many errors emitted, stopping now [-ferror-limit=]

I'd like to bootstrap clang and build libc++ and libc++abi, then use the
compiled clang to build clang++ and link against libc++ instead of libstdc++

I've read: https://llvm.org/docs/AdvancedBuilds.html
but maybe I'm missing something.
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I'm slightly confused. Are you saying you're trying to build clang using
gcc and not g++ to bootstrap? If so, that isn't going to work. We don't
support bootstrapping clang with only a C compiler. You need a full C++ compiler
and C++11 runtime.

It also looks like you're putting libc++ in llvm/projects. Try putting
libc++, libc++abi, compiler-rt, and openmp under llvm/runtimes.

-Chris
> On Dec 29, 2018, at 10:52 AM, blubee blubeeme via llvm-dev <llvm-dev at
lists.llvm.org> wrote:
> 
> I can build llvm and associated tools in a 1 shot go using gcc and g++ but
trying to use only gcc and bootstrap clang to build and link with libc++ and
libc++abi
> 
> on the second phase of the build, the compilation fails
> 
> I have svn cloned 
> LLVM
> CLANG
> CLANG_XTRA_TOOLS
> LLD
> LLDB
> POLLY
> COMPILER_RT
> OPENMP
> LIBCXX
> LIBCXXABI
> 
> cmake command below
> cmake -DCMAKE_BUILD_TYPE=Release 
> -DLLVM_ENABLE_ASSERTIONS=OFF -DCMAKE_INSTALL_PREFIX=/usr/local -GNinja 
> -DCLANG_ENABLE_BOOTSTRAP=ON ../toolchain70/llvm/
> 
> after that cmake command I run ninja stage2 which compiles about 3700
objects then it proceeds to try and compile the full 5000 plus objects but fails
with errors like these:
> 
> _toolchain70/llvm/projects/libcxx/include/cstdlib:114:9: error: no member
named 'strtold' in the global namespace
> using ::strtold;
>       ~~^
> fatal error: too many errors emitted, stopping now [-ferror-limit=]
> 
> I'd like to bootstrap clang and build libc++ and libc++abi, then use
the compiled clang to build clang++ and link against libc++ instead of libstdc++
> 
> I've read: https://llvm.org/docs/AdvancedBuilds.html
<https://llvm.org/docs/AdvancedBuilds.html>
> but maybe I'm missing something.
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
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Chris Bieneman via llvm-dev <llvm-dev at lists.llvm.org> writes:
> It also looks like you're putting libc++ in llvm/projects. Try putting
> libc++, libc++abi, compiler-rt, and openmp under llvm/runtimes.
I wasn't aware of this capability.  How will it work in the new monorepo
scheme?

                                 -David